Sorry if the title is confusing. Basically I want to ask people "who has done a certain thing for the most number/times" but I don't know to properly construct the sentence.
Please help me.
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Numbers can be great, large or high. So, speaking of numbers, you can use 'greatest' as the superlative form:
Who has done it (that thing or trick) the greatest number of times?
If you mean a physical handmade thing (like a piece of jewelry):
Who has made/produced the greatest number of copies of that thing?